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Overview of Media Gateway Control Protocol

Figure 1-2

Telephone/fax

Figure 1-3

Telephone/fax

Overview of Media Gateway Control Protocol

The Media Gateway Control Protocol (MGCP) is the Internet Engineering Task Force (IETF) standard

for multimedia conferencing over IP. MGCP is an ASCII-based, application-layer control protocol

(defined in RFC2705) that can be used to establish, maintain, and terminate calls between two or more

endpoints.

Like other VoIP protocols, MGCP is designed to address the functions of signaling and session

management within a packet telephony network.

Signaling allows call information to be carried across network boundaries. Session management

provides the ability to control the attributes of an end-to-end call.

One aspect of MGCP that differs from other VoIP protocols is that MGCP endpoints rely on instructions

from a Call Agent to control call progression, call tones, and call characteristics.

MGCP provides the following capabilities to the control server:

•

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for MGCP (version 3.0)

1-2

The Cisco ATA 186 as an Endpoint in an MGCP Network

Ethernet

Cisco ATA 186

The Cisco ATA 188 as an Endpoint in an MGCP Network

Ethernet

Cisco ATA 188

Determines the location of the target endpoint.

Determines the media capabilities of the target endpoint. Using Session Description Protocol (SDP),

MGCP determines the lowest level of common service between the endpoints. Conferences are

established using only the media capabilities that can be supported by all endpoints.

Chapter 1

Broadband

Broadband CPE

(DSL, cable,

fixed wireless)

Broadband

Broadband CPE

(DSL, cable,

fixed wireless)

Cisco Analog Telephone Adaptor Overview

Voice

Layer 3

gateway

IP infrastructure

Call Agent